Added examples Xcode project.
Added info on executing files in examples.
Added examples Xcode project with external build targets and clarified in README.
Typecast vars to suppress warnings.
Added example-created files to .gitignore.
Updated Xcode project and fixed warnings.
Updated .gitignore to ignore testSnap-created files.
Added snap-adv and glib-adv to project.
Updated Xcode project.
Merge pull request #16 from nshelly/master

Updated Xcode project for examples and snap-core.